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.1 PATENTED i A vP51325' |1868,

s IeMUNn ULIIMAN, or New Y,oI .I ,N. Y.

1 Letters Patent No. 74,867, dated February 25, 1868.1

IMPROVEMENT III rnvntorss.

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T0 ALL WHOM I'I MAY CONGE-RN:

Be it known that I, SIGMUND ULLMAN, of the city, county,land State of New York, have invented a new and improved Envelope; and I do hereby declare the followingl to be a. full, clear, and exact description ofthe same, suiieient to enable those skilled in the art to which my invention appertains to make use of it, reference being had to the accompanying drawings forming part of this specification, and in which- Figure 1 represents a plan of' my'improved envelope, the dark lines showing it folded, and the red lines showing it open. l i i Figure 2 is a cross-section ofthe same.

Figure 3 is a plan ofthe same.

Figure 4 is a plan ofthe same when folded and sealed.

In this invention'a new method of constructing, folding, and sealing the envelope is employed, by which the use of adhesive gum is dispensed with, and when the envelope is sealed it is impossible for any one to open and close it again, without leaving evidence of the transaction upon it. I

In making this envelope, I first cut the paper into the form shown by the outside red line, A, of g. l; I then break or crease it along the lines a a, c c, and le e, after which it is ready to be folded and sealed. Having thus prepared the material, I fold the ends inward along the lines a a, to form the aps of the envelope, and fold the edges of the i'laps, one inward and the other outward, along the line c c, about half an inch from the 'edge of the paper. I then press the flaps down upon the central portion of the paper and interlock their edges, as shown at m m in g. 2. After this, the curved edges or anges F F are to berbent over along the 11in`es e e, and folded clown upon the iiaps across the ends of the envelope on its rear side. The envelope is now closed and ready to be sealed. This I accomplish without the use of gurnor any other adhesive substance, by means. of three light neat metallic eyelets, n n, two of which pass entirely through the envelope and anges F F, the other, at the centre ofthe envelope, only passing through the edges m m ofthe aps, where they areinterlocked, and confining them securely in that position.

In order to render it impossible for any one to remove these eyelets and insert them again without leaving evidence of it on the envelope, I stamp the paper, at the points where the eyelets are to be inserted, with al small circular stamp or seal, v, the centre of' which is just large enough to admit the neck of the eyelet, while close around the hole through which the latter passes, the stamp or seal is so lettered, printed, or figured, that the eyelet when once inserted cannot `be removed without tearing across and mutilating the narrow ring thus lettered, print-ed, or figured. In this way itis impossible for any one, after the letter is closed and sealed, to

i open the envelope without so defacing the impression upon thepaper around the edge of the eyelet as to render detection certain. Y

This device has a very neat appearance, and its weight does not exceed that of the common envelope. It can be manufactured at less expense than any hitherto in use, as it economizesthc material to the utmost attainable degree. It is convenient to open and close, and is in every respect amore effective protection to the enclosed letter than any hitherto in common use.

I'Iaving thus described'my invention, what I claim as new, and desire to secure by Letters Patent, is

l. The envelope formed with the end-flanges or flaps F F, and the folded and interlocking edges m m, substantially as and for the purpose specified.

2. The combination of the eyelets n n, and stamped or printed impressions v r around them, when oon-- strueted and employed substantially as and for the purposes specified. i

SIGMUND ULLMAN. I* Witnesses: l

JAMES H. GRIDLEY, E. W. B. PHILLIPS. 

